Preserve server group assignments during TF deployment
Preserve server group assignments during TF deployment

Change-Id: Ibcd604806944a878ddfca78768323276f5b8629a
Reviewed-on: https://review.couchbase.org/c/perfrunner/+/179006
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Bo-Chun Wang <bb86fd206c9c35341feb9b50e74a74a83e254d63@couchbase.com>

couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner